PREDICTION OF INTERNAL FLOW FIELD IN A HIGH SPEED IMPELLER WITH VISCOUS BODY FORCE TECHNIQUE

It is very important of understanding the internal flow field in high speed centrifugal compressor in order to design an impeller with higher efficiency and high pressure ratio.In this paper,a three-dimensional viscous code has been developed to solve simplified Reynolds-averaged Navier-Stokes equations .The viscosity is simulated with viscous body force method.The governing equations are spatially discretized in the cell-vertex finite volume scheme on a simple H mesh and temporally integrated by an explicit two-step Runge-Kutta scheme.The turbulence closure is made by using Baldwin-Lomax model.This code is demonstrated for predicting the internal flow field of a high speed impeller.Some laser measure data are also illustrated to testify the calculated results.